10. Heart trouble is one of the most serious of death among old people.A. reasonsB. troub

发布时间：2020-08-16 06:50:13


10. Heart trouble is one of the most serious      of death among old people.
A. reasons
B. troubles
C. illnesses
D. Causes

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A. reasons
B. troubles
C. illnesses
(答案→)D. Causes
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